Cyclopenta[b]naphthalene derivatives

ABSTRACT

The present invention relates to cyclopenta[b]naphthalene derivatives of the general formula (I) in which Z, A, n, R, L 5  and L 8  as (II) and (III) are as defined in Claim 1, to the use thereof in liquid-crystalline or mesogenic media, to liquid-crystalline or mesogenic media comprising at least one of these cyclopenta[b]naphthalene derivatives, and to electro-optical display elements containing these liquid-crystalline or mesogenic media

The present invention relates to cyclopenta[b]naphthalene derivatives, to the use thereof in liquid-crystalline or mesogenic media, to liquid-crystalline or mesogenic media comprising these derivatives, and to electro-optical display elements containing these liquid-crystalline or mesogenic media.

Liquid crystals have found widespread use since the first commercially usable liquid-crystalline compounds were found about 30 years ago. Known areas of application are, in particular, displays for watches and pocket calculators, and large display panels as used in railway stations, airports and sports arenas. Further areas of application are displays of portable computers and navigation systems and video applications. For the last-mentioned applications in particular, high demands are made of the response times and contrast of the images.

The spatial arrangement of the molecules in a liquid crystal has the effect that many of its properties are direction-dependent. Of particular importance for use in liquid-crystal displays are the optical, dielectric and elasto-mechanical anisotropies. Depending on whether the molecules are oriented with their longitudinal axes perpendicular or parallel to the two plates of a capacitor, the latter has a different capacitance; in other words, the dielectric constant ε of the liquid-crystalline medium has different values for the two orientations. Substances whose dielectric constant is larger in the case of a perpendicular orientation of the longitudinal axes of the molecules to the capacitor plates than in the case of a parallel arrangement are referred to as dielectrically positive. Most liquid crystals used in conventional displays fall into this group.

Both the polarisability of the molecule and permanent dipole moments play a role for the dielectric anisotropy. On application of a voltage to the display, the longitudinal axis of the molecules orients itself in such a way that the larger of the dielectric constants becomes effective. The strength of the interaction with the electric field depends on the difference between the two constants. In the case of small differences, higher switching voltages are necessary than in the case of large differences. The incorporation of suitable polar groups, such as, for example, nitrile groups or fluorine, into the liquid-crystal molecules enables a broad range of working voltages to be achieved.

In the case of the liquid-crystalline molecules used in conventional liquid-crystal displays, the dipole moment oriented along the longitudinal axis of the molecules is larger than the dipole moment oriented perpendicular to the longitudinal axis of the molecules. The orientation of the larger dipole moment along the longitudinal axis of the molecule also determines the orientation of the molecule in a liquid-crystal display in the field-free state. In the most widespread TN (“twisted nematic”) cells, a liquid-crystalline layer with a thickness of only from about 5 to 10 μm is arranged between two flat glass plates, onto each of which an electrically conductive, trans-parent layer of tin oxide or indium tin oxide has been vapour-deposited as electrode. A likewise transparent alignment layer, which usually consists of a plastic (for example polyimides), is located between these films and the liquid-crystalline layer. This alignment layer serves to bring the longitudinal axes of the adjacent crystalline molecules into a preferential direction through surface forces in such a way that, in the voltage-free state, they lie uniformly on the inside of the display surface with the same orientation in a flat manner or with the same small tilt angle. Two polarisation films which only enable linear-polarised light to enter and escape are adhesively bonded to the outside of the display in a certain arrangement.

By means of liquid crystals in which the larger dipole moment is oriented parallel to the longitudinal axis of the molecule, very high-performance displays have already been developed. In most cases here, mixtures of from 5 to 20 components are used in order to achieve a sufficiently broad temperature range of the mesophase and short response times and low threshold voltages. However, difficulties are still caused by the strong viewing-angle dependence in liquid-crystal displays as are used, for example, for laptops. The best imaging quality can be achieved if the surface of the display is perpendicular to the viewing direction of the observer. If the display is tilted relative to the observation direction, the imaging quality drops drastically under certain circumstances. For greater comfort, attempts are being made to make the angle through which the display can be tilted from the viewing direction of an observer as large as possible. Attempts have recently been made to improve the viewing-angle dependence using liquid-crystalline compounds whose dipole moment perpendicular to the longitudinal axis of the molecules is larger than that parallel to the longitudinal axis of the molecule. In the field-free state, these molecules are oriented perpendicular to the glass surface of the display. In this way, it has been possible to achieve an improvement in the viewing-angle dependence. Displays of this type are known as VA-TFT (“vertically aligned”) displays.

DE 44 34 974 A1 discloses tricyclic compounds of the general formula

in which the symbols and indices have the following meanings:

-   R¹ is —F, —CN, —Cl, —CF₃ or has, independently of R², one of the     meanings mentioned for R²; -   R² is H or a straight-chain or branched alkyl radical having from 1     to 20 carbon atoms (with or without an asymmetrical carbon atom), in     which, in addition, one or more —CH₂— groups (but not those bonded     directly to the five-membered ring) may be replaced by —O—, —S—,     —CH≡CH—, —C≡C—, cyclo-propane-1,2-diyl, —Si(CH₃)₂—, 1,4-phenylene,     1,4-cyclohexylene, 1,3-cyclo-pentylene, 1,3-cyclobutylene,     1,3-dioxane-2,5-diyl, with the proviso that oxygen atoms and sulfur     atoms must not be bonded directly, and in which, in addition, one or     more H atoms of the alkyl radical may be substituted by F, Cl, Br or     OR³, or an optically active or racemic group;

Ring B is

-   A¹ is 1,4-phenylene, 1,4-cyclohexylene, pyridine-2,5-diyl,     pyrimidine-2,5-diyl, 1,3-thiazole-2,5-diyl, 1,3-thiazole-2,4-diyl,     in which, in addition, one or more hydrogens may be substituted by     F, 1,3,4-thiadiazole-2,5-diyl; -   M¹ is a single bond, —C≡C—, —CH₂CH₂—, —O—CO—, —CO—O—, —CO—, —OCH₂—,     —CH₂O— or —O—CO—O—; and m is zero or one.

However, the Δε of the compounds disclosed in this document is not sufficient to ensure satisfactory properties, for example in VA-TFT displays.

Development in the area of liquid-crystalline materials is far from complete. In order to improve the properties of liquid-crystalline display elements, attempts are constantly being made to develop novel compounds which enable such displays to be optimised.

An object of the present invention was to provide compounds having advantageous properties for use in liquid-crystalline media.

This object is achieved in accordance with the invention by cyclopenta[b]-naphthalene derivatives of the general formula (I)

in which:

-   Z is in each case, independently of one another, a single bond, a     double bond, —CF₂O—, —OCF₂—, —CH₂CH₂—, —CF₂CF₂—, —C(O)O—, —OC(O)—,     —CH₂O—, —OCH₂—, —CF═CH—, —CH═CF—, —CF═CF—, —CH═CH—, —CH═CH— or     —C≡C—, -   A is in each case, independently of one another, 1 ,4-phenylene, in     which ═CH— may be replaced once or twice by ═N—, and which may be     monosubstituted to tetrasubstituted, independently of one another,     by halogen (—F, —Cl, —Br, —I), —CN, —CH₃, —CH₂F, —CHF₂, —CF₃, —OCH₃,     —OCH₂F, —OCHF₂ or —OCF₃, 1,4-cyclohexylene, 1,4-cyclohexenylene or     1,4-cyclohexadienylene, in which —CH₂— may be replaced once or     twice, independently of one another, by —O— or —S— in such a way     that heteroatoms are not directly adjacent, and which may be     monosubstituted or polysubstituted by halogen, or is     1,3-cyclobutylene or bicyclo[2.2.2]octane, -   R is hydrogen, an alkyl, alkoxy, alkenyl or alkynyl radical having     from 1 to 15 or 2 to 15 carbon atoms respectively which is     unsubstituted, monosubstituted by —CF₃ or at least monosubstituted     by halogen, where, in addition, one or more CH₂ groups in these     radicals may each, independently of one another, be replaced by —O—,     —S—, —CO—, —COO—, —OCO— or —OCO—O— in such a way that heteroatoms     are not directly adjacent, halogen, —CN, —SCN, —NCS, —SF₅, —CF₃,     —OCF₃, —OCHF₂ or —OCH₂F, -   n is 0, 1, 2 or 3, and

L¹-L⁸ are each, independently of one another, hydrogen, an alkyl, alkoxy, alkenyl or alkynyl radical having from 1 to 15 or 2 to 15 carbon atoms respectively which is unsubstituted or at least mono-substituted by halogen, where, in addition, one or more CH₂ groups in these radicals may each, independently of one another, be replaced by —O—, —S—, —CO—, —COO—, —OCO— or —OCO—O— in such a way that heteroatoms are not directly adjacent, halogen, —CN, —SCN, —NCS, —SF₅, —CF₃, —OCF₃, —OCHF₂, —OCH₂F or -(Z-A-)_(n)—R.

A further object of the present invention was to provide liquid-crystalline compounds, in particular for use in VA-TFT displays.

This object is achieved in accordance with the invention by the provision of cyclopenta[b]naphthalene derivatives of negative Δε.

The present invention thus relates, in particular, to cyclopenta[b]naphthalene derivatives of the general formulae (II) to (VI)

-   Z is in each case, independently of one another, a single bond, a     double bond, —CF₂O—, —OCF₂—, —CH₂CH₂—, —CF₂CF₂—, —C(O)O—, —OC(O)—,     —CH₂O—, —OCH₂—, —CF═CH—, —CH═CF—, —CF═CF—, —CH═CH— or —C≡C—, -   A is in each case, independently of one another, 1,4-phenylene, in     which ═CH— may be replaced once or twice by ═N—, and which may be     monosubstituted to tetrasubstituted, independently of one another,     by halogen (—F, —Cl, —Br, —I), —CN, —CH₃, —CH₂F, —CHF₂, —CF₃, —OCH₃,     —OCH₂F, —OCHF₂ or —OCF₃, 1,4-cyclohexylene, 1,4-cyclohexenylene or     1,4-cyclohexadienylene, in which —CH₂— may be replaced once or     twice, independently of one another, by —O— or —S— in such a way     that heteroatoms are not directly adjacent, and which may be     monosubstituted or polysubstituted by halogen, or is     1,3-cyclobutylene or bicyclo[2.2.2]octane, -   R is hydrogen, an alkyl, alkoxy, alkenyl or alkynyl radical having     from 1 to 15 or 2 to 15 carbon atoms respectively which is     unsubstituted, monosubstituted by —CF₃ or at least monosubstituted     by halogen, where, in addition, one or more CH₂ groups in these     radicals may each, independently of one another, be replaced by —O—,     —S—, —CO—, —COO—, —OCO— or —OCO—O— in such a way that heteroatoms     are not directly adjacent, halogen, —CN, —SCN, —NCS, —SF₅, —CF₃,     —OCF₃, —OCHF₂ or —OCH₂F, -   L², L³ and L⁸ are each, independently of one another, hydrogen, an     alkyl, alkoxy, alkenyl or alkynyl radical having from 1 to 15 or 2     to 15 carbon atoms respectively which is unsubstituted or at least     mono-substituted by halogen, where, in addition, one or more CH₂     groups in these radicals may each, independently of one another, be     replaced by —O—, —S—, —CO—, —COO—, —OCO— or —OCO—O— in such a way     that heteroatoms are not directly adjacent, halogen, —CN, —SCN,     —NCS, —SF₅, —CF₃, —OCF₃, —OCHF₂, —OCH₂F or -(Z-A-)_(n)-R,

L⁴ and L⁶ are each, independently of one another, hydrogen, an alkyl, alkoxy, alkenyl or alkynyl radical having from 1 to 15 or 2 to 15 carbon atoms respectively which is at least monosubstituted by halogen, where, in addition, one or more CH₂ groups in these radicals may each, independently of one another, be replaced by —O—, —S—, —CO—, —COO—, —OCO— or —OCO—O— in such a way that hetero-atoms are not directly adjacent, halogen, —CN, —SF₅, —SCN, —NCS, —CF₃, —OCF₃, —OCHF₂ or —OCH₂F, preferably with the proviso that L⁴ and L⁶ cannot simultaneously be hydrogen, and

-   n is 0, 1, 2 or 3.

Preference is given to cyclopenta[b]naphthalene derivatives of the general formulae (II), (III), (V) and (VI), and particular preference is given to cyclopenta[b]naphthalene derivatives of the general formulae (II) and (VI).

The compounds all have negative Δε and are therefore suitable, in particular, for use in VA-TFT displays. The compounds according to the invention preferably have a Δε of <−2 and particularly preferably a Δε of <−5. They exhibit very good compatibility with the conventional substances used in liquid-crystal mixtures for displays.

The substituents, preferably fluorine substituents, in the naphthalene structure and the electronegative atoms in ring B generate a dipole moment perpendicular to the longitudinal axis of the molecules, which can, if desired, be further strengthened by suitable substituents in the wing units -(Z-A-)_(n)-R. In the field-free state, the compounds of the formulae (II) to (VI) orient themselves with their longitudinal axis of the molecules perpendicular to the treated or coated glass surface of the display.

in the general formulae (II) to (VI) are preferably

particularly preferably

and in particular

In the general formulae (II) to (VI), A are preferably, independently of one another, optionally substituted 1,4-phenylene, optionally substituted 1,4-cyclohexylene, in which —CH₂— may be replaced once or twice by —O—, or optionally substituted 1,4-cyclohexenylene.

A are particularly preferably, independently of one another,

Preferred groups Z in the compounds of the general formulae (II) to (VI) are each, independently of one another, a single bond, —CF₂O—, —OCF₂—, —CF₂CF₂—, —CH═CH—, —CF═CH—, —CH═CF— or —CF═CF—, particularly preferably a single bond, —CF₂O—, —OCF₂—, —CF₂CF₂—, —CF═CH—, —CH═CF— or —CF═CF—.

-   R, L² and L³ in the general formulae (II) to (VI) may each,     independently of one another, be an alkyl radical and/or an alkoxy     radical having from 1 to 15 carbon atoms, which may be     straight-chain or branched. It is preferably straight-chain, has 1,     2, 3, 4, 5, 6 or 7 carbon atoms and accordingly is preferably     methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, methoxy,     ethoxy, propoxy, butoxy, pentoxy, hexyloxy or heptyloxy. -   R, L² and L³ may each, independently of one another, be oxaalkyl,     preferably straight-chain 2-oxapropyl(=methoxymethyl),     2-(=ethoxymethyl) or 3-oxabutyl(=methoxyethyl), 2-, 3- or     4-oxapentyl, 2-, 3-, 4- or 5-oxahexyl, 2-, 3-, 4-, 5- or     6-oxaheptyl. -   R, L² and L³ may each, independently of one another, be an alkenyl     radical having from 2 to 15 carbon atoms, which may be     straight-chain or branched. It is preferably straight-chain and has     from 2 to 7 carbon atoms. Accordingly, it is preferably vinyl,     prop-1- or prop-2-enyl, but-1-, 2- or but-3-enyl, pent-1-, 2-, 3- or     pent-4-enyl, hex-1-, 2-, 3-, 4- or hex-5-enyl, hept-1-, 2-, 3-, 4-,     5- or hept-6-enyl. -   R, L² and L³ may each, independently of one another, be an alkyl     radical having from 1 to 15 carbon atoms in which one CH₂ group has     been replaced by —O— and one has been replaced by —CO—, where these     are preferably adjacent. This thus contains an acyloxy group —CO—O—     or an oxycarbonyl group —O—CO—. This is preferably straight-chain     and has from 2 to 6 carbon atoms. -   R, L² and L³ may each, independently of one another, be an alkyl     radical having from 1 to 15 carbon atoms in which one CH₂ group has     been replaced by unsubstituted or substituted —CH═CH— and an     adjacent CH₂ group has been replaced by CO or CO—O or O—CO, where     this may be straight-chain or branched. It is preferably     straight-chain and has from 4 to 13 carbon atoms. -   R, L² and L³ may each, independently of one another, be an alkyl     radical having from 1 to 15 carbon atoms or alkenyl radical having     from 2 to 15 carbon atoms, each of which is monosubstituted by —CN     or —CF₃, where these are preferably straight-chain. The substitution     by —CN or —CF₃ is possible in any desired position. -   R, L² and L³ may each, independently of one another, be an alkyl     radical in which two or more CH₂ groups have been replaced by —O—     and/or —CO—O—, where this may be straight-chain or branched. It is     preferably branched and has from 3 to 12 carbon atoms. -   R, L², L³, L⁴ and L⁶ may each, independently of one another, be an     alkyl radical having from 1 to 15 carbon atoms or alkenyl radical     having from 2 to 15 carbon atoms, each of which is at least     monosubstituted by halogen, where these radicals are preferably     straight-chain and halogen is preferably —F or —Cl. In the case of     polysubstitution, halogen is preferably —F. The resultant radicals     also include perfluorinated radicals, such as —CF₃. In the case of     monosubstitution, the fluorine or chlorine substituent can be in any     desired position, but is preferably in the ω-position. -   R in the general formulae (II) to (VI) is particularly preferably an     alkyl radical, alkoxy radical or alkenyl radical having from 1 to 7     or 2 to 7 carbon atoms respectively. -   L² and L³ in the general formulae (II) to (VI) is preferably     hydrogen, an alkyl radical, alkoxy radical or alkenyl radical having     from 1 to 7 or 2 to 7 carbon atoms respectively or a halogen,     particularly preferably hydrogen, an alkoxy radical having from 1 to     7 carbon atoms, fluorine or chlorine, and in particular fluorine.

L⁴ and L⁶ in the general formulae (II) to (VI) is preferably hydrogen, an alkyl radical, alkoxy radical or alkenyl radical having from 1 to 7 or 2 to 7 carbon atoms respectively, each of which is at least monosubstituted by halogen, or a halogen, particularly preferably —CF₃, fluorine or chlorine, and in particular fluorine.

-   L⁸ in the general formulae (II) to (VI) is preferably fluorine.

Preferred compounds of the general formulae (II) to (VI) have no, one or two wing units ZA, i.e. n=0, 1 or 2, particularly preferably n=1.

A further object of the present invention was to provide compounds, in particular for use in mesogenic control media, where these control media are employed, in particular, in electro-optical light-control elements which are operated at a temperature at which the mesogenic control medium in the unaddressed state is in the isotropic phase.

This object is achieved in accordance with the invention by the provision of cyclopenta[b]naphthalene derivatives of positive Δε.

The present invention thus relates, in particular, to cyclopenta[b]naphthalene derivatives of the general formulae (VII) to (XI)

in which Z, A, R, n, L¹ to L⁸ and

have the meanings indicated in relation to the formula (I).

Preference is given to cyclopenta[b]naphthalene derivatives of the general formulae (VII) and (XI), and particular preference is given to cyclopenta[b]-naphthalene derivatives of the general formula (VII).

The compounds of the formulae (VII) to (XI) all have positive Δε. The compounds of the formulae (VII) to (XI) according to the invention preferably have a Δε of >+10, particularly preferably a Δε of >+15 and in particular a Δε of >+20. They exhibit very good compatibility with the conventional substances used in mesogenic control media.

The cyclopenta[b]naphthalene derivatives of the general formula (VII) preferably have the following structural formulae:

where the structural formulae (VIIa) and (VIIc) are particularly preferred.

in the general formulae (VII) to (XI) are preferably particularly preferably

In the general formulae (VII) to (XI), A are preferably, independently of one another, optionally substituted 1,4-phenylene, optionally substituted 1,4-cyclohexylene, in which —CH₂— may be replaced once or twice by —O—, or optionally substituted 1,4-cyclohexenylene.

A are particularly preferably, independently of one another,

Preferred groups Z in the compounds of the general formulae (VII) to (XI) are each, independently of one another, a single bond, —CF₂O—, —OCF₂—, —CF₂CF₂—, —CH═CH—, —CF═CH—, —CH═CF— or —CF═CF—, particularly preferably a single bond, —CF₂O—, —OCF₂—, —CF₂CF₂— or —CF═CF—.

-   R and L¹ to L⁸ in the general formulae (VII) to (XI) may each,     independently of one another, be an alkyl radical and/or an alkoxy     radical having from 1 to 15 carbon atoms, which may be     straight-chain or branched. It is preferably straight-chain, has 1,     2, 3, 4, 5, 6 or 7 carbon atoms and accordingly is preferably     methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, methoxy,     ethoxy, propoxy, butoxy, pentoxy, hexoxy or heptoxy. -   R and L¹ to L⁸ in the general formulae (VII) to (XI) may each,     independently of one another, be oxaalkyl, preferably straight-chain     2-oxapropyl(=methoxymethyl), 2-(=ethoxymethyl) or     3-oxabutyl(=methoxyethyl), 2-, 3- or 4-oxapentyl, 2-, 3-, 4- or     5-oxahexyl, 2-, 3-, 4-, 5- or 6-oxaheptyl. -   R and L¹ to L⁸ in the general formulae (VII) to (XI) may each,     independently of one another, be an alkenyl radical having from 2 to     15 carbon atoms, which may be straight-chain or branched. It is     preferably straight-chain and has from 2 to 7 carbon atoms.     Accordingly, it is preferably vinyl, prop-1- or prop-2-enyl, but-1-,     2- or but-3-enyl, pent-1-, 2-, 3- or pent-4-enyl, hex-1-, 2-, 3-, 4-     or hex-5-enyl, hept-1-, 2-, 3-, 4-, 5- or hept-6-eny -   R and L¹ to L⁸ in the general formulae (VII) to (XI) may each,     independently of one another, be an alkyl radical having from 1 to     15 carbon atoms in which one CH₂ group has been replaced by —O— and     one has been replaced by —CO—, where these are preferably adjacent.     This thus contains an acyloxy-group —CO—O— or an oxycarbonyl group     —O—CO—. This is preferably straight-chain and has from 2 to 6 carbon     atoms. -   R and L¹ to L⁸ in the general formulae (VII) to (XI) may each,     independently of one another, be an alkyl radical having from 1 to     15 carbon atoms in which one CH₂ group has been replaced by     unsubstituted or substituted —CH═CH— and an adjacent CH₂ group has     been replaced by CO or CO—O or O—CO, where this may be     straight-chain or branched. It is preferably straight-chain and has     from 4 to 13 carbon atoms. -   R and L¹ to L⁸ in the general formulae (VII) to (XI) may each,     independently of one another, be an alkyl radical having from 1 to     1.5 carbon atoms or alkenyl radical having from 2 to 15 carbon     atoms, each of which is monosubstituted by —CN or —CF₃, where these     are preferably straight-chain. The substitution by —CN or —CF₃ is     possible in any desired position. -   R and L¹ to L⁸ in the general formulae (VII) to (XI) may each,     independently of one another, be an alkyl radical in which two or     more CH₂ groups have been replaced by —O— and/or —CO—O—, where this     may be straight-chain or branched. It is preferably branched and has     from 3 to 12 carbon atoms. -   R and L¹ to L⁸ in the general formulae (VII) to (XI) may each,     independently of one another, be an alkyl radical having from 1 to     15 carbon atoms or alkenyl radical having from 2 to 15 carbon atoms,     each of which is at least monosubstituted by halogen, where these     radicals are preferably straight-chain and halogen is preferably —F     or —Cl. In the case of polysubstitution, halogen is preferably —F.     The resultant radicals also include per-fluorinated radicals, such     as —CF₃. In the case of monosubstitution, the fluorine or chlorine     substituent can be in any desired position, but is preferably in the     ω-position. -   R in the general formulae (VII) to (XI) is particularly preferably     an alkyl radical, alkoxy radical or alkenyl radical having from 1 to     7 or 2 to 7 carbon atoms respectively, in particular an alkyl     radical having from 1 to 7 carbon atoms. -   L² and L³ in the general formulae (VII) to (XI) is preferably,     independently of one another, identical or different and is     hydrogen, halogen, —CN, —SCN, —NCS, —SF₅, —CF₃, —CHF₂, —OCF₃ or     —OCHF₂, particularly preferably hydrogen, fluorine, —CF₃ or —OCF₃.     In particular, however, L² and/or L³ is not hydrogen. -   L¹ and L⁴ in the general formulae (VII) to (XI) is preferably,     independently of one another, identical or different and is hydrogen     or fluorine. Particularly preferably, however, L¹=L⁴=H or L¹=L⁴=F. -   L⁵ and L⁶ in the general formulae (VII) to (XI) is preferably     hydrogen.

Particular preference is given to compounds of the general formulae (VII) to (XI) in which L1=L2=L3=L4=F and L5=L6=H.

Preferred compounds of the general formulae (VII) to (XI) have no, one or two wing units ZA, i.e. n=0, 1 or 2, particularly preferably n=1.

The compounds of the general formulae (I), (II) to (VI) and (VII) to (XI) are prepared by methods known per se, as described in the literature (for example in the standard works, such as Houben-Weyl, Methoden der organischen Chemie [Methods of Organic Chemistry], Georg-Thieme-Verlag, Stuttgart), to be precise under reaction conditions which are known and are suitable for the said reactions. Use can be made here of variants known per se, which are not mentioned here in greater detail.

If desired, the starting materials can also be formed in situ by not isolating them from the reaction mixture, but instead immediately converting them further into the compounds of the general formulae (I) to (XI).

The syntheses of various polysubstituted naphthalene derivatives which are used to build up the five-membered ring are described by way of example in the examples. The starting substances are obtainable by generally accessible literature procedures or commercially. The reactions described should likewise be regarded as known from the literature.

An illustrative synthesis for building up the five-membered ring is shown below. The synthesis can be adapted to the particular desired compounds of the general formulae (I) to (XI) through the choice of suitable starting materials.

Starting from the 3-bromonaphthalene a, reaction with an α,β-unsaturated aldehyde b in the presence of lithium diisopropylamide (LDA) gives compound c. This reacts with palladium catalysis in the presence of triethylamine with ring closure to give the ketone d. From the ketone d and 1,3-propanedithiol in the presence of BF₃/diethyl ether, the corresponding dithiane e is obtained. This is reacted with 1,3-dibromo-5,5-dimethylhydantoin (DBH) and HF in pyridine to give the cyclopenta[b]naphthalene derivative f. Elimination of HBr in the presence of diazabicycloundecene (DBU) gives the cyclopenta[b]naphthalene derivative g. The cyclopenta[b]naphthalene derivative g is hydrogenated on the palladium/carbon catalyst in a hydrogen atmosphere to give the cyclopenta[b]naphthalene derivative h.

The reactions described should only be regarded as illustrative. The person skilled in the art can carry out corresponding variations of the syntheses described and also follow other suitable synthetic routes in order to obtain compounds of the formulae (I) to (XI).

As already mentioned, the compounds of the general formulae (I) to (XI) can be used in liquid-crystalline media.

The present invention therefore also relates to a liquid-crystalline medium comprising at least two liquid-crystalline compounds, comprising at least one compound of the general formulae (I) to (XI).

The present invention also relates to liquid-crystalline media comprising from 2 to 40, preferably from 4 to 30, components as further constituents besides one or more compounds of the formulae (I), (II), (III), (IV), (V), (VI), (VII), (VIII), (IX), (X) and/or (XI) according to the invention. These media particularly preferably comprise from 7 to 25 components besides one or more compounds according to the invention. These further constituents are preferably selected from nematic or nematogenic (monotropic or isotropic) substances, in particular substances from the classes of the azoxybenzenes, benzylideneanilines, biphenyls, terphenyls, phenyl or cyclohexyl benzoates, phenyl or cyclohexyl esters of cyclohexanecarboxylic acid, phenyl or cyclohexyl esters of cyclohexylbenzoic acid, phenyl or cyclohexyl esters of cyclohexylcyclohexanecarboxylic acid, cyclohexylphenyl esters of benzoic acid, of cyclohexanecarboxylic acid or of cyclohexylcyclohexanecarboxylic acid, phenylcyclohexanes, cyclohexylbiphenyls, phenylcyclohexylcyclohexanes, cyclohexylcyclohexanes, cyclohexylcyclohexylcyclohexenes, 1,4-biscyclohexylbenzenes, 4′,4′-biscyclohexylbiphenyls, phenyl- or cyclo-hexylpyrimidines, phenyl- or cyclohexylpyridines, phenyl- or cyclohexyldioxanes, phenyl- or cyclohexyl-1,3-dithianes, 1,2-diphenylethanes, 1,2-dicyclohexylethanes, 1-phenyl-2-cyclohexylethanes, 1-cyclohexyl-2-(4-phenyl-cyclohexyl)ethanes, 1-cyclohexyl-2-biphenylethanes, 1-phenyl-2-cyclohexyl-phenylethanes, optionally halogenated stilbenes, benzyl phenyl ethers, tolans and substituted cinnamic acids. The 1,4-phenylene groups in these compounds may also be fluorinated.

The most important compounds suitable as further constituents of media according to the invention can be characterised by the formulae (1), (2), (3), (4) and (5): R′-L-E-R″  (1) R′-L-COO-E-R″  (2) R′-L-OOC-E-R″  (3) R′-L-CH₂CH₂-E-R″  (4) R′-L-CF₂O-E-R″  (5)

In the formulae (1), (2), (3), (4) and (5), L and E, which may be identical or different, are each, independently of one another, a divalent radical from the group formed by -Phe-, -Cyc-, -Phe-Phe-, -Phe-Cyc-, -Cyc-Cyc-, -Pyr-, -Dio-, -G-Phe- and -G-Cyc- and their mirror images, where Phe is unsubstituted or fluorine-substituted 1,4-phenylene, Cyc is trans-1,4-cyclohexylene or 1,4-cyclohexylene, Pyr is pyrimidine-2,5-diyl or pyridine-2,5-diyl, Dio is 1,3-dioxane-2,5-diyl, and G is 2-(trans-1,4-cyclohexyl)ethyl.

One of the radicals L and E is preferably Cyc or Phe. E is preferably Cyc, Phe or Phe-Cyc. The media according to the invention preferably comprise one or more components selected from the compounds of the formulae (1), (2), (3), (4) and (5) in which L and E are selected from the group consisting of Cyc and Phe and simultaneously one or more components selected from the compounds of the formulae (1), (2), (3), (4) and (5) in which one of the radicals L and E is selected from the group consisting of Cyc and Phe and the other radical is selected from the group consisting of -Phe-Phe-, -Phe-Cyc-, -Cyc-Cyc-, -G-Phe- and -G-Cyc-, and optionally one or more components selected from the compounds of the formulae (1), (2), (3), (4) and (5) in which the radicals L and E are selected from the group consisting of -Phe-Cyc-, -Cyc-Cyc-, -G-Phe- and -G-Cyc-.

In a smaller sub-group of the compounds of the formulae (1), (2), (3), (4) and (5), R′ and R″ are each, independently of one another, alkyl, alkenyl, alkoxy, alkoxyalkyl, alkenyloxy or alkanoyloxy having up to 8 carbon atoms. This smaller sub-group is called group A below, and the compounds are referred to by the sub-formulae (1a), (2a), (3a), (4a) and (5a). In most of these compounds, R′ and R″ are different from one another, one of these radicals usually being alkyl, alkenyl, alkoxy or alkoxyalkyl.

In another smaller sub-group of the compounds of the formulae (1), (2), (3), (4) and (5), which is referred to as group B, E is

In the compounds of group B, which are referred to by the sub-formulae (1b), (2b), (3b), (4b) and (5b), R′ and R″ are as defined for the compounds of the sub-formulae (1a) to (5a) and are preferably alkyl, alkenyl, alkoxy or alkoxyalkyl.

In a further smaller sub-group of the compounds of the formulae (1), (2), (3), (4) and (5), R″ is —CN; this sub-group is referred to below as group C, and the compounds of this sub-group are correspondingly described by sub-formulae (1c), (2c), (3c), (4c) and (5c). In the compounds of the sub-formulae (1c), (2c), (3c), (4c) and (5c), R′ is as defined for the compounds of the sub-formulae (1a) to (5a) and is preferably alkyl, alkenyl, alkoxy or alkoxyalkyl.

Besides the preferred compounds of groups A, B and C, other compounds of the formulae (1), (2), (3), (4) and (5) having other variants of the proposed substituents are also customary. All these substances are obtainable by methods which are known from the literature or analogously thereto.

Besides the compounds of the general formulae (I), (II), (III), (IV), (V), (VI), (VII), (VIII), (IX), (X) and/or (XI) according to the invention, the media according to the invention preferably comprise one or more compounds from groups A, B and/or C. The proportions by weight of the compounds from these groups in the media according to the invention are:

-   group A: from 0 to 90%, preferably from 20 to 90%, in particular     from 30 to 90% -   group B: from 0 to 80%, preferably from 10 to 80%, in particular     from 10 to 70% -   group C: from 0 to 80%, preferably from 5 to 80%, in particular from     5 to 50%.

The media according to the invention preferably comprise from 1 to 40%, particularly preferably from 5 to 30%, of the compounds of the formulae (I), (II), (III), (IV), (V), (VI), (VII), (VIII), (IX), (X) and/or (XI) according to the invention. Preference is furthermore given to media comprising more than 40%, in particular from 45 to 90%, of compounds of the formulae (I), (II), (III), (IV), (V), (VI), (VII), (VII), (IX), (X) and/or (XI) according to the invention. The media preferably comprise three, four or five compounds of the formulae (I), (II), (III), (IV), (V), (VI), (VII), (VIII), (IX), (X) and/or (XI) according to the invention.

Examples of the compounds of the formulae (1), (2), (3), (4) and (5) are the compounds listed below:

where R¹, R², independently of one another, —C_(n)H_(2n+1) or —OC_(n)H_(2n+1), and n=1 to 8, and L¹, L², independently of one another, —H or —F.

where m, n, independently of one another, from 1 to 8.

The media according to the invention are prepared in a manner conventional per se. In general, the components are dissolved in one another, advantageously at elevated temperature. By means of suitable additives, the liquid-crystalline phases of the present invention can be modified in such a way that they can be used in all types of liquid-crystal display elements that have been disclosed hitherto. Additives of this type are known to the person skilled in the art and are described in detail in the literature (H. Kelker/R. Hatz, Handbook of Liquid Crystals, Verlag Chemie, Weinheim, 1980). For example, pleochroic dyes can be added for the preparation of coloured guest-host systems or substances can be added in order to modify the dielectric anisotropy, the viscosity and/or the orientation of the nematic phases.

Owing to their negative Δε, the compounds of the formulae (II) to (VI) are particularly suitable for use in VA-TFT displays.

The present invention therefore also relates to electro-optical liquid-crystal display elements containing a liquid-crystalline medium according to the invention.

Owing to their high positive Δε, the compounds of the formulae (VII) to (XI) are particularly suitable for use in mesogenic control media, these control media being employed, in particular, in electro-optical light-control elements which are operated at a temperature at which the mesogenic control medium in the unaddressed state is in the isotropic phase.

The present invention therefore also relates to electro-optical light-control elements, as disclosed, for example, in DE 102 17 273 A1, which contain an electrode arrangement, at least one element for polarisation of the light and a mesogenic control medium, where the light-control element is operated at a temperature at which the mesogenic control medium in the unaddressed state is in the isotropic phase, and which are characterised in that the mesogenic control medium comprises one or more compounds of the formulae (VII) to (XI).

The invention is explained in greater detail below with reference to working examples, but without being restricted thereby.

EXAMPLES

The starting substances can be obtained by generally accessible literature procedures or commercially. The reactions described are known from the literature.

A) Preparation of the Naphthalene Derivatives

Example 1

200 ml (100 mmol) of a 0.5 M solution of the zinc compound 2 in THF are added at −75° C. to a solution of 20.0 g (98.5 mmol) of the aldehyde 1 in 100 ml of THF. After 30 minutes, the cooling is removed. Water is added to the thawed batch, which is acidified using 1 N HCl solution and extracted with tert-butyl methyl (MTB) ether. Drying, evaporation and chromatography on silica gel gives the hydroxy ester 3.

A solution of 10.0 g (32.7 mmol) of the hydroxy ester 3 is added at room temperature to a suspension of 40.0 mmol of pyridinium chlorochromate (PCC) on 50 g of Celite® in 150 ml of dichloromethane. When the reaction is complete (TLC), the batch is filtered, and the filter cake is washed with methylene chloride. Evaporation and chromatography on silica gel gives the keto ester 4.

9.0 g (29.7 mmol) of the keto ester 4 are added at 60° C. to 100 g of poly-phosphoric acid. The temperature is subsequently increased to 120° C. for 4 hours. After cooling, the batch is added to ice and extracted with tertbutyl methyl (MTB) ether. Drying, evaporation and crystallisation gives the diketone 5.

5.0 g (19.5 mmol) of the diketone 5 are dissolved in 5 ml of ethanol, 3 ml of 100% hydrazinium hydroxide and 0.5 ml of water are added, and the mixture is refluxed for 30 minutes. A solution of 800 mg of sodium in 15 ml of ethanol is subsequently added to the reaction vessel. The batch is heated at 140° C. until the evolution of nitrogen is complete. ⅔ of the ethanol is subsequently distilled off. The residue is diluted with 50 ml of water and extracted with ether. The extract is washed with 10% KOH, 5% HCl and 30% sodium hydrogensulfite solution. Drying, evaporation and chromatography on silica gel gives the tetrahydronaphthalene 6.

Example 2

8.0 g (31.1 mmol) of the diketone 5 are dissolved in 150 ml of ethanol, and 2.4 g (65.0 mmol) of sodium borohydride are added in portions. When the reaction is complete (TLC), the batch is hydrolysed using water, the ethanol is removed under reduced pressure, and the residue is taken up in water and extracted with toluene. After evaporation, the product is employed in the next step without further purification.

10.0 g (38.3 mmol) of the diol 7 are dissolved in 200 ml of toluene, 1 g of p-toluenesulfonic acid is added, and the mixture is refluxed until the separation of water is complete. Evaporation and filtration through silica gel gives the naphthalene derivative 8.

Example 3

30 ml of boron trifluoride/diethyl ether complex are added under nitrogen to a solution of 15.0 g (49.5 mmol) of the keto ester 4 and 8.4 ml (100 mmol) of the dithiol in 150 ml of dichloromethane, and the mixture is stirred overnight. The batch is slowly added to saturated sodium hydrogen-carbonate solution and deacidified. Drying, evaporation and chromatography on silica gel gives the protected ketone 9.

A solution of 10 g (26.4 mmol) of the protected ketone 9 in 60 ml of dichloromethane is added at −75° C. to a suspension of 30.2 g (105.2 mmol) of 1,3-dibromo-5,5-dimethylhydantoin in 60 ml of dichloromethane and 120 ml of a 65% solution of hydrogen fluoride in pyridine. The batch is slowly warmed to 0° C. over the course of 3 hours and added to 1500 ml of ice-cooled 2 N sodium hydroxide solution to which 120 ml of a 39% sodium hydrogensulfite solution have been added. The pH is adjusted to 8, and the aqueous phase is extracted with methylene chloride. Drying, evaporation and chromatography on silica gel gives the fluorinated ester 10.

Ring closure of the fluorinated ester 10 to give compound 11 is carried out as described in Example 1.

Reduction to the alkane 12 is carried out as described in Example 1.

Example 4

Reduction of compound 11 to the alcohol 13 and subsequent elimination of water to give the dihydronaphthalene derivative 14 are carried out as described in Example 2.

Example 5

A solution of 9 g (34.2 mmol) of the dihydronaphthalene derivative 14 in 50 ml of THF is slowly added to a suspension of 4.5 g (40.1 mmol) of potassium tert-butoxide in 50 ml of THF, and the mixture is subsequently refluxed overnight. The cooled batch is diluted with water and extracted with diethyl ether. Drying, evaporation and chromatography on silica gel gives the naphthalene 15.

Example 6

22 ml of a 2 M lithium diisopropylamide (LDA) solution are added at −78° C. to a solution of 6.8 g (21.4 mmol) of the keto ester 4 in 80 ml of THF. After 1 hour, 2.6 g (24.0 mmol) of chlorotrimethylsilane are added. After thawing, the solvents are removed under reduced pressure, and the residue is employed in the subsequent step without further purification.

4.9 g (19.8 mmol) of N-fluoropyridinium triflate are added to a solution of 5 g of the crude enol ether 16, and the mixture is refluxed overnight. The solvent is removed under reduced pressure, and the residue is purified by chromatography on silica gel, giving the fluorinated product 17.

The conversions of the fluorinated product 17 into the dihydronaphthalene derivative 21 are carried out as already described in Examples 3 and 4.

Example 7

The conversion of the dihydronaphthalene derivative 21 into the naphthalene derivative 22 is carried out as already described in Example 5.

Example 8

The conversion of compound 20 into the dihydronaphthalene derivative 24 is carried out as already described in Examples 4 and 5.

Example 9

The hydroxy ester 3 is reacted with benzyl bromide in dimethylformamide (DMF) in the presence of potassium carbonate for four hours at 120° C. After cooling, the batch is added to ice-water and extracted with tert-butyl methyl (MTB) ether. Drying, evaporation and crystallisation gives the ester 25.

The conversion of the ester 25 into the ketone 26 and the reduction thereof to the ether 27 takes place as described in Example 1.

The ether 27 dissolved in THF is reacted on palladium/carbon catalyst in a hydrogen atmosphere. Evaporation and chromatography on silica gel gives the hydroxyl compound 28.

The conversion of the hydroxyl compound 28 into the ketone 29 is carried out as described in Example 1.

The ketone 29 is reacted with iodobenzene diacetate and KOH in methanol for four hours at from 0 to 20° C., giving the hydroxy ketone 30.

The conversion of the hydroxy ketone 30 into the dithiolane 31 and the conversion thereof into the fluorinated hydroxyl compound 32 take place as described in Example 3.

The fluorinated hydroxyl compound 32 is mixed with pyridine and POCl₃ with ice cooling. Alcohol is subsequently added. The reaction is carried out for four hours at 60° C. After cooling, the batch is added to ice-water and extracted with tert-butyl methyl (MTB) ether. Drying, evaporation and crystallisation gives the unsaturated fluorinated compound 33.

Example 10

48.0 g (200 mmol) of the aromatic compound 34, 4.8 g (200 mmol) of magnesium and 200 ml of toluene/THF (4:1) are used to prepare the corresponding Grignard compound. 22.5 g (100 mmol) of zinc bromide are subsequently introduced. After 1 hour, 57.6 g (200 mmol) of the aldehyde 35 in 50 ml of solvent are added. After a further 2 hours, water is added to the batch, and the latter is acidified with dil. HCl solution. The aqueous phase is extracted three times with MTB ether. Drying, evaporation and chromatography gives 60.4 g of the ester 36.

A solution of 50 g (124 mmol) of the ester 36 in 100 ml of dichloromethane is added at room temperature to a suspension of 40.0 g (186 mmol) of pyridinium chlorochromate (PCC) and 80 g of Celite in 300 ml of dichloromethane, and the mixture is stirred until conversion is complete (TLC). Filtration, evaporation and chromatography gives 47.1 g of the oxo ester 37.

45 g (113 mol) of the ester 37 are refluxed for 20 hours with a solution of 20 g of potassium hydroxide in 50 ml of water and 150 ml of ethanol. The alcohol is subsequently removed, and the residue is taken up with water and acidified using HCl solution. The aqueous phase is extracted three times with MTB ether. The organic phase is dried and evaporated. 20 ml of thionyl chloride are added to the residue, and the mixture is refluxed until the evolution of gas is complete. Excess thionyl chloride is distilled off, and the residue is employed in the next step without further purification.

A solution of the acid chloride 38 in 50 ml of dichloromethane is added at −25° C. to a suspension of 18.0 g (136 mmol) of aluminium chloride in 50 ml of dichloromethane. The batch is held at a temperature below −12° C. until conversion is complete (TLC). The reaction is subsequently terminated by careful addition of water (50 ml). The precipitated solid is dissolved by means of HCl solution. The aqueous phase is extracted twice with dichloromethane, and the organic phase is dried and evaporated. Chromatography gives 30.2 g of the diketone 39.

30.0 g (84.8 mmol) of the diketone 39 are dissolved in 150 ml of ethanol, and 6.3 g (170 mmol) of sodium borohydride are added in portions. When the reaction is complete (TLC), the batch is hydrolysed using water, the ethanol is removed under reduced pressure, and the residue is taken up in water and extracted with toluene. After evaporation, the product is employed in the next step without further purification.

The crude diol 40 is dissolved in 200 ml of toluene, 2 g of p-toluenesulfonic acid are added, and the mixture is refluxed until the separation of water is complete. Evaporation and filtration through silica gel gives 24.7 g of the naphthalene 41.

B) Preparation of the Cyclopenta[b]Naphthalene Derivatives

Example 11

A solution of 13.5 g (60.0 mmol) of the bromofluoronaphthalene 7 in 10 ml of THF is added at −75° C. to 27.0 ml of a solution, diluted with 100 ml of THF, of 2 N lithium diisopropylamide (LDA) in cyclohexane/ethylbenzene/THF (52.4 mmol). After 2 hours at the low temperature, 8.5 g (47.3 mmol) of the aldehyde 42 in 10 ml of THF are added. After 30 minutes, the cooling is removed, and 100 ml of 1 N HCl are added to the batch at 20° C. Extraction of the aqueous phase, drying of the organic phase, evaporation and chromatography gives the allyl alcohol 43.

35.0 g (86.6 mmol) of the allyl alcohol 43, 5.5 g of bis(tri-o-tolylphosphine)-palladium dichloride and 50 ml of triethylamine are dissolved in 390 ml of acetonitrile, and the mixture is warmed at 90° C. until the allyl alcohol has reacted completely. The cooled batch is added to water. Extraction, drying, evaporation and chromatography gives the ketone 44.

Example 12

10.0 g (30.8 mmol) of the ketone 44 and 3.2 ml (31.0 mmol) of propanedithiol are dissolved in 50 ml of dichloromethane, and 7.0 ml of boron trifluoride/diethyl ether complex are added at from 6 to 7° C., and the mixture is subsequently stirred overnight at room temperature. The batch is added to 10 ml of saturated sodium hydrogencarbonate solution and stirred until the evolution of gas is complete. After extraction of the aqueous phase, drying of the organic phase, evaporation and filtration through silica gel, the resultant residue is employed in the next step without further purification.

10.0 g of the crude thioketal 45 dissolved in 30 ml of dichloromethane are slowly added at −75° C. to a mixture of 28.6 g (100 mmol) of 1,3-dibromo-5,5-dimethylhydantoin (DBH), 80 ml of a 65% solution of hydrogen fluoride in pyridine and 50 ml of dichloromethane. The batch is subsequently stirred overnight at room temperature. The reaction mixture is added to ice-cooled hydrogen sulfite solution and deacidified using saturated sodium hydrogencarbonate solution and sodium hydroxide solution. Extraction, drying, evaporation, re-washing with water, chromatography and crystallisation from hexane gives the cyclopenta[b]naphthalene derivative 46.

6.0 g (14.1 mmol) of the cyclopenta[b]naphthalene derivative 46 are dissolved in 50 ml of dichloromethane, 2.4 ml (16.0 mmol) of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) are added, and the mixture is stirred at room temperature until the starting material has reacted completely. The batch is washed with water and saturated sodium chloride solution, evaporated and subjected to chromatography. The cyclopenta[b]naphthalene derivative 47 is isolated.

Example 13

4.0 g (11.6 mmol) of the cyclopenta[b]naphthalene derivative 47 are dissolved in 50 ml of THF and hydrogenated at room temperature and atmospheric pressure on a palladium catalyst. Evaporation, chromatography on silica gel and crystallisation gives the cyclopenta[b]naphthalene derivative 48.

The Δn and Δε values of the compound according to the invention were obtained by extrapolation from liquid-crystalline mixtures consisting of 5% of the compound according to the invention and 95% of one of the two commercially available liquid-crystal mixtures ZLI 4792 and ZLI 2857 (Merck, Darmstadt).

Δn: 0.1418 (ZLI 4792, 589 nm, 20° C.)

ΔεF: 4.9 (ZLI 2857, 1 kHz, 20° C.)

Clearing point: 158.6° C. (ZLI 4792)

Example 14

38.0 ml of an n-butyllithium solution in n-hexane are added at −75° C. to a solution of 20.0 g (62.1 mmol) of the naphthalene 41 in 100 ml of diethyl ether, and the mixture is stirred for 1 hour. 11.2 g (62.1 mmol) of the aldehyde 49 in 50 ml of diethyl ether are subsequently added, and the mixture is stirred overnight. Water is added to the batch. The aqueous phase is extracted with diethyl ether, and the organic phase is dried and evaporated. Chromatography gives 21.2 g of the allyl alcohol 50.

20.0 g (47.2 mmol) of the allyl alcohol 50 are dissolved in 175 ml of acetonitrile and 25 ml of triethylamine, 2.5 g of bis-tri-o-tolylphosphinepalladium(II) chloride are added, and the mixture is warmed at 90° C. until the starting material has disappeared (HPLC). The batch is subsequently added to saturated sodium chloride solution. Extraction with MTB ether, drying, evaporation and chromatography on silica gel gives 10.5 g of the ketone 51.

10.0 g (29.2 mmol) of the ketone 51 are dissolved in 75 ml of ethanol, and 3.2 g (86 mmol) of sodium borohydride are added in portions. When the reaction is complete (TLC), the batch is hydrolysed using water, the ethanol is removed under reduced pressure, and the residue is taken up in water and extracted with toluene. After evaporation, the product is employed in the next step without further purification. The crude alcohol is dissolved in 100 ml of toluene, 1 g of p-toluenesulfonic acid is added, and the mixture is refluxed until the separation of water is complete. Evaporation and filtration through silica gel gives 8.5 of the naphthalene 52.

8.0 g (25.5 mmol) of the naphthalene 52 are dissolved in 50 ml of THF and hydrogenated on a palladium catalyst. Evaporation and chromatography on silica gel gives 7.9 g of the hydrogenated substance 53.

The following compounds are prepared analogously to Examples 1 to 14 or analogously to known synthetic steps:

Examples 15 to 29

Example L³ L⁴ L⁵ Z R 15 H H F Bd. CH₃ 16 H F F Bd. C₂H₅ 17 H F F Bd. C₃H₇ 18 F F F Bd. C₃H₇ 19 F F F Bd. C₄H₉ 20 OC₂H₅ F F Bd. C₃H₇ 21 OC₂H₅ F F Bd. C₅H₁₁ 22 H H F —CF₂CF₂— CH₃ 23 H H F —CF₂CF₂— C₃H₇ 24 H F F —CF₂CF₂— C₂H₅ 25 H F F —CF₂CF₂— C₃H₇ 26 F F F —CF₂CF₂— C₃H₇ 27 F F F —CF₂CF₂— C₄H₉ 28 OC₂H₅ F F —CF₂CF₂— C₃H₇ 29 OC₂H₅ F F —CF₂CF₂— C₅H₁₁ Bd. = single bond

Examples 30 to 53

Example L³ L⁴ L⁵ Z R 30 H H F Bd. CH₃ 31 H H F Bd. C₃H₇ 32 H F F Bd. C₂H₅ 33 H F F Bd. C₃H₇ 34 F F F Bd. C₃H₇ 35 F F F Bd. C₄H₉ 36 OC₂H₅ F F Bd. C₃H₇ 37 OC₂H₅ F F Bd. C₅ H₁₁ 38 H H F —CF₂O— CH₃ 39 H H F —CF₂O— C₃H₇ 40 H F F —CF₂O— C₂H₅ 41 H F F —CF₂O— C₃H₇ 42 F F F —CF₂O— C₃H₇ 43 F F F —CF₂O— C₄H₉ 44 OC₂H₅ F F —CF₂O— C₃H₇ 45 OC₂H₅ F F —CF₂O— C₅H₁₁ 46 H H F —CF₂CF₂— CH₃ 47 H H F —CF₂CF₂— C₃H₇ 48 H F F —CF₂CF₂— C₂H₅ 49 H F F —CF₂CF₂— C₃H₇ 50 F F F —CF₂CF₂— C₃H₇ 51 F F F —CF₂CF₂— C₄H₉ 52 OC₂H₅ F F —CF₂CF₂— C₃H₇ 53 OC₂H₅ F F —CF₂CF₂— C₅H₁₁ Bd. = single bond

Examples 54 to 77

Example L³ L⁴ L⁵ Z R 54 H H F Bd. CH₃ 55 H H F Bd. C₃H₇ 56 H F F Bd. C₂H₅ 57 H F F Bd. C₃H₇ 58 F F F Bd. C₃H₇ 59 F F F Bd. C₄H₉ 60 OC₂H₅ F F Bd. C₃H₇ 61 OC₂H₅ F F Bd. C₅H₁₁ 62 H H F —CF₂O— CH₃ 63 H H F —CF₂O— C₃H₇ 64 H F F —CF₂O— C₂H₅ 65 H F F —CF₂O— C₃H₇ 66 F F F —CF₂O— C₃H₇ 67 F F F —CF₂O— C₄H₉ 68 OC₂H₅ F F —CF₂O— C₃H₇ 69 OC₂H₅ F F —CF₂O— C₅H₁₁ 70 H H F —CF₂CF₂— CH₃ 71 H H F —CF₂CF₂— C₃H₇ 72 H F F —CF₂CF₂— C₂H₅ 73 H F F —CF₂CF₂— C₃H₇ 74 F F F —CF₂CF₂— C₃H₇ 75 F F F —CF₂CF₂— C₄H₉ 76 OC₂H₅ F F —CF₂CF₂— C₃H₇ 77 OC₂H₅ F F —CF₂CF₂— C₅H₁₁ Bd. = single bond

Examples 78 to 93

Example L³ L⁴ L⁵ Z R 78 H H F Bd. CH₃ 79 H H F Bd. C₃H₇ 80 H F F Bd. C₂H₅ 81 H F F Bd. C₃H₇ 82 F F F Bd. C₃H₇ 83 F F F Bd. C₄H₉ 84 OC₂H₅ F F Bd. C₃H₇ 85 OC₂H₅ F F Bd. C₅H₁₁ 86 H H F —CF₂CF₂— CH₃ 87 H H F —CF₂CF₂— C₃H₇ 88 H F F —CF₂CF₂— C₂H₅ 89 H F F —CF₂CF₂— C₃H₇ 90 F F F —CF₂CF₂— C₃H₇ 91 F F F —CF₂CF₂— C₄H₉ 92 OC₂H₅ F F —CF₂CF₂— C₃H₇ 93 OC₂H₅ F F —CF₂CF₂— C₅H₁₁ Bd. = single bond

Examples 94 to 117

Example L³ L⁴ L⁵ Z R 94 H H F Bd. CH₃ 95 H H F Bd. C₃H₇ 96 H F F Bd. C₂H₅ 97 H F F Bd. C₃H₇ 98 F F F Bd. C₃H₇ 99 F F F Bd. C₄H₉ 100 OC₂H₅ F F Bd. C₃H₇ 101 OC₂H₅ F F Bd. C₅H₁₁ 102 H H F —CF₂O— CH₃ 103 H H F —CF₂O— C₃H₇ 104 H F F —CF₂O— C₂H₅ 105 H F F —CF₂O— C₃H₇ 106 F F F —CF₂O— C₃H₇ 107 F F F —CF₂O— C₄H₉ 108 OC₂H₅ F F —CF₂O— C₃H₇ 109 OC₂H₅ F F —CF₂O— C₅H₁₁ 110 H H F —CF₂CF₂— CH₃ 111 H H F —CF₂CF₂— C₃H₇ 112 H F F —CF₂CF₂— C₂H₅ 113 H F F —CF₂CF₂— C₃H₇ 114 F F F —CF₂CF₂— C₃H₇ 115 F F F —CF₂CF₂— C₄H₉ 116 OC₂H₅ F F —CF₂CF₂— C₃H₇ 117 OC₂H₅ F F —CF₂CF₂— C₅H₁₁ Bd. = single bond

Examples 118 to 141

Example L³ L⁴ L⁵ Z R 118 H H F Bd. CH₃ 119 H H F Bd. C₃H₇ 120 H F F Bd. C₂H₅ 121 H F F Bd. C₃H₇ 122 F F F Bd. C₃H₇ 123 F F F Bd. C₄H₉ 124 OC₂H₅ F F Bd. C₃H₇ 125 OC₂H₅ F F Bd. C₅H₁₁ 126 H H F —CF₂O— CH₃ 127 H H F —CF₂O— C₃H₇ 128 H F F —CF₂O— C₂H₅ 129 H F F —CF₂O— C₃H₇ 130 F F F —CF₂O— C₃H₇ 131 F F F —CF₂O— C₄H₉ 132 OC₂H₅ F F —CF₂O— C₃H₇ 133 OC₂H₅ F F —CF₂O— C₅H₁₁ 134 H H F —CF₂CF₂— CH₃ 135 H H F —CF₂CF₂— C₃H₇ 136 H F F —CF₂CF₂— C₂H₅ 137 H F F —CF₂CF₂— C₃H₇ 138 F F F —CF₂CF₂— C₃H₇ 139 F F F —CF₂CF₂— C₄H₉ 140 OC₂H₅ F F —CF₂CF₂— C₃H₇ 141 OC₂H₅ F F —CF₂CF₂— C₅H₁₁ Bd. = single bond

Examples 142 to 157

Example L³ L⁴ L⁵ Z R 142 H H H Bd. CH₃ 143 H H H Bd. C₃H₇ 144 H F F Bd. C₂H₅ 145 H F F Bd. C₃H₇ 146 F F F Bd. C₃H₇ 147 F F F Bd. C₄H₉ 148 OC₂H₅ F F Bd. C₃H₇ 149 OC₂H₅ F F Bd. C₅H₁₁ 150 H H H —CF₂CF₂— CH₃ 151 H H H —CF₂CF₂— C₃H₇ 152 H F F —CF₂CF₂— C₂H₅ 153 H F F —CF₂CF₂— C₃H₇ 154 F F F —CF₂CF₂— C₃H₇ 155 F F F —CF₂CF₂— C₄H₉ 156 OC₂H₅ F F —CF₂CF₂— C₃H₇ 157 OC₂H₅ F F —CF₂CF₂— C₅H₁₁ Bd. = single bond

Examples 158 to 181

Example L³ L⁴ L⁵ Z R 158 H H H Bd. CH₃ 159 H H H Bd. C₃H₇ 160 H F F Bd. C₂H₅ 161 H F F Bd. C₃H₇ 162 F F F Bd. C₃H₇ 163 F F F Bd. C₄H₉ 164 OC₂H₅ F F Bd. C₃H₇ 165 OC₂H₅ F F Bd. C₅H₁₁ 166 H H H —CF₂O— CH₃ 167 H H H —CF₂O— C₃H₇ 168 H F F —CF₂O— C₂H₅ 169 H F F —CF₂O— C₃H₇ 170 F F F —CF₂O— C₃H₇ 171 F F F —CF₂O— C₄H₉ 172 OC₂H₅ F F —CF₂O— C₃H₇ 173 OC₂H₅ F F —CF₂O— C₅H₁₁ 174 H H H —CF₂CF₂— CH₃ 175 H H H —CF₂CF₂— C₃H₇ 176 H F F —CF₂CF₂— C₂H₅ 177 H F F —CF₂CF₂— C₃H₇ 178 F F F —CF₂CF₂— C₃H₇ 179 F F F —CF₂CF₂— C₄H₉ 180 OC₂H₅ F F —CF₂CF₂— C₃H₇ 181 OC₂H₅ F F —CF₂CF₂— C₅H₁₁ Bd. = single bond

Examples 182 to 205

Example L³ L⁴ L⁵ Z R 182 H H H Bd. CH₃ 183 H H H Bd. C₃H₇ 184 H F F Bd. C₂H₅ 185 H F F Bd. C₃H₇ 186 F F F Bd. C₃H₇ 187 F F F Bd. C₄H₉ 188 OC₂H₅ F F Bd. C₃H₇ 189 OC₂H₅ F F Bd. C₅H₁₁ 190 H H H —CF₂O— CH₃ 191 H H H —CF₂O— C₃H₇ 192 H F F —CF₂O— C₂H₅ 193 H F F —CF₂O— C₃H₇ 194 F F F —CF₂O— C₃H₇ 195 F F F —CF₂O— C₄H₉ 196 OC₂H₅ F F —CF₂O— C₃H₇ 197 OC₂H₅ F F —CF₂O— C₅H₁₁ 198 H H H —CF₂CF₂— CH₃ 199 H H H —CF₂CF₂— C₃H₇ 200 H F F —CF₂CF₂— C₂H₅ 201 H F F —CF₂CF₂— C₃H₇ 202 F F F —CF₂CF₂— C₃H₇ 203 F F F —CF₂CF₂— C₄H₉ 204 OC₂H₅ F F —CF₂CF₂— C₃H₇ 205 OC₂H₅ F F —CF₂CF₂— C₅H₁₁ Bd. = single bond

Examples 206 to 217

Example L³ L⁴ L⁵ L⁶ Z R 206 H H H H Bd. CH₃ 207 H H H H Bd. C₃H₇ 208 H H F F Bd. C₂H₅ 209 H H F F Bd. C₃H₇ 210 F F F F Bd. C₃H₇ 211 F F F F Bd. C₄H₉ 212 H H H H —CF₂CF₂— CH₃ 213 H H H H —CF₂CF₂— C₃H₇ 214 H H F F —CF₂CF₂— C₂H₅ 215 H H F F —CF₂CF₂— C₃H₇ 216 F F F F —CF₂CF₂— C₃H₇ 217 F F F F —CF₂CF₂— C₄H₉ Bd. = single bond

Examples 218 to 235

Example L³ L⁴ L⁵ L⁶ Z R 218 H H H H Bd. CH₃ 219 H H H H Bd. C₃H₇ 220 H H F F Bd. C₂H₅ 221 H H F F Bd. C₃H₇ 222 F F F F Bd. C₃H₇ 223 F F F F Bd. C₄H₉ 224 H H H H —CF₂O— CH₃ 225 H H H H —CF₂O— C₃H₇ 226 H H F F —CF₂O— C₂H₅ 227 H H F F —CF₂O— C₃H₇ 228 F F F F —CF₂O— C₃H₇ 229 F F F F —CF₂O— C₄H₉ 230 H H H H —CF₂CF₂— CH₃ 231 H H H H —CF₂CF₂— C₃H₇ 232 H H F F —CF₂CF₂— C₂H₅ 233 H H F F —CF₂CF₂— C₃H₇ 234 F F F F —CF₂CF₂— C₃H₇ 235 F F F F —CF₂CF₂— C₄H₉ Bd. = single bond

Examples 236 to 253

Example L³ L⁴ L⁵ L⁶ Z R 236 H H H H Bd. CH₃ 237 H H H H Bd. C₃H₇ 238 H H F F Bd. C₂H₅ 239 H H F F Bd. C₃H₇ 240 F F F F Bd. C₃H₇ 241 F F F F Bd. C₄H₉ 242 H H H H —CF₂O— CH₃ 243 H H H H —CF₂O— C₃H₇ 244 H H F F —CF₂O— C₂H₅ 245 H H F F —CF₂O— C₃H₇ 246 F F F F —CF₂O— C₃H₇ 247 F F F F —CF₂O— C₄H₉ 248 H H H H —CF₂CF₂— CH₃ 249 H H H H —CF₂CF₂— C₃H₇ 250 H H F F —CF₂CF₂— C₂H₅ 251 H H F F —CF₂CF₂— C₃H₇ 252 F F F F —CF₂CF₂— C₃H₇ 253 F F F F —CF₂CF₂— C₄H₉ Bd. = single bond

Examples 254 to 265

Example L³ L⁴ L⁵ L⁶ Z R 254 H H H H Bd. CH₃ 255 H H H H Bd. C₃H₇ 256 H H F F Bd. C₂H₅ 257 H H F F Bd. C₃H₇ 258 F F F F Bd. C₃H₇ 259 F F F F Bd. C₄H₉ 260 H H H H —CF₂CF₂— CH₃ 261 H H H H —CF₂CF₂— C₃H₇ 262 H H F F —CF₂CF₂— C₂H₅ 263 H H F F —CF₂CF₂— C₃H₇ 264 F F F F —CF₂CF₂— C₃H₇ 265 F F F F —CF₂CF₂— C₄H₉ Bd. = single bond

Examples 266 to 283

Example L³ L⁴ L⁵ L⁶ Z R 266 H H H H Bd. CH₃ 267 H H H H Bd. C₃H₇ 268 H H F F Bd. C₂H₅ 269 H H F F Bd. C₃H₇ 270 F F F F Bd. C₃H₇ 271 F F F F Bd. C₄H₉ 272 H H H H —CF₂O— CH₃ 273 H H H H —CF₂O— C₃H₇ 274 H H F F —CF₂O— C₂H₅ 275 H H F F —CF₂O— C₃H₇ 276 F F F F —CF₂O— C₃H₇ 277 F F F F —CF₂O— C₄H₉ 278 H H H H —CF₂CF₂— CH₃ 279 H H H H —CF₂CF₂— C₃H₇ 280 H H F F —CF₂CF₂— C₂H₅ 281 H H F F —CF₂CF₂— C₃H₇ 282 F F F F —CF₂CF₂— C₃H₇ 283 F F F F —CF₂CF₂— C₄H₉ Bd. = single bond

Examples 284 to 301

Example L³ L⁴ L⁵ L⁶ Z R 284 H H H H Bd. CH₃ 285 H H H H Bd. C₃H₇ 286 H H F F Bd. C₂H₅ 287 H H F F Bd. C₃H₇ 288 F F F F Bd. C₃H₇ 289 F F F F Bd. C₄H₉ 290 H H H H —CF₂O— CH₃ 291 H H H H —CF₂O— C₃H₇ 292 H H F F —CF₂O— C₂H₅ 293 H H F F —CF₂O— C₃H₇ 294 F F F F —CF₂O— C₃H₇ 295 F F F F —CF₂O— C₄H₉ 296 H H H H —CF₂CF₂— CH₃ 297 H H H H —CF₂CF₂— C₃H₇ 298 H H F F —CF₂CF₂— C₂H₅ 299 H H F F —CF₂CF₂— C₃H₇ 300 F F F F —CF₂CF₂— C₃H₇ 301 F F F F —CF₂CF₂— C₄H₉ Bd. = single bond

TABLE 1 Δε and Δn values for substances of individual examples Example No. Δε Δn 17 −6.3 0.143 18 −8.0 0.143 20 −7.3 0.166 79 −3.9 0.127 81 −9.1 0.117 82 −10.2 0.121 143 −3.3 0.091 145 −11.8 0.081 146 −9.2 0.081 207 −2.2 0.128 209 −9.6 0.115 210 −6.9 0.106 255 −3.0 0.095 257 −10.3 0.079 258 −7.9 0.079

Examples 302 to 337

Example L¹ L² L³ L⁴ R 302 H F H H CH₃ 303 H F H H C₃H₇ 304 H F H H C₅H₁₁ 305 H F F H C₂H₅ 306 H F F H C₃H₇ 307 H F F H C₆H₁₃ 308 F F F F CH₃ 309 F F F F C₃H₇ 310 F F F F C₅H₁₁ 311 H CF₃ H H C₂H₅ 312 H CF₃ H H C₃H₇ 313 H CF₃ H H C₆H₁₃ 314 H OCF₃ H H CH₃ 315 H OCF₃ H H C₃H₇ 316 H OCF₃ H H C₅H₁₁ 317 H CN H H C₂H₅ 318 H CN H H C₃H₇ 319 H CN H H C₆H₁₃ 320 H CF₃ F H C₂H₅ 321 H CF₃ F H C₃H₇ 322 H CF₃ F H C₆H₁₃ 323 H OCF₃ F H CH₃ 324 H OCF₃ F H C₃H₇ 325 H OCF₃ F H C₅H₁₁ 326 H CF₃ CF₃ H C₂H₅ 327 H CF₃ CF₃ H C₃H₇ 328 H CF₃ CF₃ H C₆H₁₃ 329 H CF₃ OCF₃ H CH₃ 330 H CF₃ OCF₃ H C₃H₇ 331 H CF₃ OCF₃ H C₅H₁₁ 332 H OCF₃ OCF₃ H C₂H₅ 333 H OCF₃ OCF₃ H C₃H₇ 334 H OCF₃ OCF₃ H C₆H₁₃ 335 H CN CN H C₂H₅ 336 H CN CN H C₃H₇ 337 H CN CN H C₆H₁₃

TABLE 2 Δε and Δn values for substances of individual examples Example No. Δε Δn 306 12.9 0.179 309 17.0 0.158 312 12.7 0.160 321 23.2 0.159 324 12.4 0.172 327 31.4 0.159 330 19.7 0.143 333 17.4 0.158

Examples 338 to 367

Example L¹ L² L³ L⁴ R 338 H F H H CH₃ 339 H F H H C₃H₇ 340 H F H H C₅H₁₁ 341 H F F H C₂H₅ 342 H F F H C₃H₇ 343 H F F H C₆H₁₃ 344 F F F F CH₃ 345 F F F F C₃H₇ 346 F F F F C₅H₁₁ 347 H CF₃ H H C₂H₅ 348 H CF₃ H H C₃H₇ 349 H CF₃ H H C₆H₁₃ 350 H OCF₃ H H CH₃ 351 H OCF₃ H H C₃H₇ 352 H OCF₃ H H C₅H₁₁ 353 H CF₃ F H C₂H₅ 354 H CF₃ F H C₃H₇ 355 H CF₃ F H C₆H₁₃ 356 H OCF₃ F H CH₃ 357 H OCF₃ F H C₃H₇ 358 H OCF₃ F H C₅H₁₁ 359 H CF₃ CF₃ H C₂H₅ 360 H CF₃ CF₃ H C₃H₇ 361 H CF₃ CF₃ H C₆H₁₃ 362 H CF₃ OCF₃ H CH₃ 363 H CF₃ OCF₃ H C₃H₇ 364 H CF₃ OCF₃ H C₅H₁₁ 365 H OCF₃ OCF₃ H C₂H₅ 366 H OCF₃ OCF₃ H C₃H₇ 367 H OCF₃ OCF₃ H C₆H₁₃

Examples 368 to 397

Example L¹ L² L³ L⁴ R 368 H F H H CH₃ 369 H F H H C₃H₇ 370 H F H H C₅H₁₁ 371 H F F H C₂H₅ 372 H F F H C₃H₇ 373 H F F H C₆H₁₃ 374 F F F F CH₃ 375 F F F F C₃H₇ 376 F F F F C₅H₁₁ 377 H CF₃ H H C₂H₅ 378 H CF₃ H H C₃H₇ 379 H CF₃ H H C₆H₁₃ 380 H OCF₃ H H CH₃ 381 H OCF₃ H H C₃H₇ 382 H OCF₃ H H C₅H₁₁ 383 H CF₃ F H C₂H₅ 384 H CF₃ F H C₃H₇ 385 H CF₃ F H C₆H₁₃ 386 H OCF₃ F H CH₃ 387 H OCF₃ F H C₃H₇ 388 H OCF₃ F H C₅H₁₁ 389 H CF₃ CF₃ H C₂H₅ 390 H CF₃ CF₃ H C₃H₇ 391 H CF₃ CF₃ H C₆H₁₁ 392 H CF₃ OCF₃ H CH₃ 393 H CF₃ OCF₃ H C₃H₇ 394 H CF₃ OCF₃ H C₅H₁₁ 395 H OCF₃ OCF₃ H C₂H₅ 396 H OCF₃ OCF₃ H C₃H₇ 397 H OCF₃ OCF₃ H C₆H₁₃

Examples 398 to 427

Example L¹ L² L³ L⁴ R 398 H F H H CH₃ 399 H F H H C₃H₇ 400 H F H H C₅H₁₁ 401 H F F H C₂H₅ 402 H F F H C₃H₇ 403 H F F H C₆H₁₃ 404 F F F F CH₃ 405 F F F F C₃H₇ 406 F F F F C₅H₁₁ 407 H CF₃ H H C₂H₅ 408 H CF₃ H H C₃H₇ 409 H CF₃ H H C₆H₁₃ 410 H OCF₃ H H CH₃ 411 H OCF₃ H H C₃H₇ 412 H OCF₃ H H C₅H₁₁ 413 H CF₃ F H C₂H₅ 414 H CF₃ F H C₃H₇ 415 H CF₃ F H C₆H₁₃ 416 H OCF₃ F H CH₃ 417 H OCF₃ F H C₃H₇ 418 H OCF₃ F H C₅H₁₁ 419 H CF₃ CF₃ H C₂H₅ 420 H CF₃ CF₃ H C₃H₇ 421 H CF₃ CF₃ H C₆H₁₃ 422 H CF₃ OCF₃ H CH₃ 423 H CF₃ OCF₃ H C₃H₇ 424 H CF₃ OCF₃ H C₅H₁₁ 425 H OCF₃ OCF₃ H C₂H₅ 426 H OCF₃ OCF₃ H C₃H₇ 427 H OCF₃ OCF₃ H C₆H₁₃

Examples 428 to 457

Example L¹ L² L³ L⁴ R 428 H F H H CH₃ 429 H F H H C₃H₇ 430 H F H H C₅H₁₁ 431 H F F H C₂H₅ 432 H F F H C₃H₇ 433 H F F H C₆H₁₃ 434 F F F F CH₃ 435 F F F F C₃H₇ 436 F F F F C₅H₁₁ 437 H CF₃ H H C₂H₅ 438 H CF₃ H H C₃H₇ 439 H CF₃ H H C₆H₁₃ 440 H OCF₃ H H CH₃ 441 H OCF₃ H H C₃H₇ 442 H OCF₃ H H C₅H₁₁ 443 H CF₃ F H C₂H₅ 444 H CF₃ F H C₃H₇ 445 H CF₃ F H C₆H₁₃ 446 H OCF₃ F H CH₃ 447 H OCF₃ F H C₃H₇ 448 H OCF₃ F H C₅H₁₁ 449 H CF₃ CF₃ H C₂H₅ 450 H CF₃ CF₃ H C₃H₇ 451 H CF₃ CF₃ H C₆H₁₃ 452 H CF₃ OCF₃ H CH₃ 453 H CF₃ OCF₃ H C₃H₇ 454 H CF₃ OCF₃ H C₅H₁₁ 455 H OCF₃ OCF₃ H C₂H₅ 456 H OCF₃ OCF₃ H C₃H₇ 457 H OCF₃ OCF₃ H C₆H₁₃

Examples 458 to 487

Example L¹ L² L³ L⁴ R 458 H F H H CH₃ 459 H F H H C₃H₇ 460 H F H H C₅H₁₁ 461 H F F H C₂H₅ 462 H F F H C₃H₇ 463 H F F H C₆H₁₃ 464 F F F F CH₃ 465 F F F F C₃H₇ 466 F F F F C₅H₁₁ 467 H CF₃ H H C₂H₅ 468 H CF₃ H H C₃H₇ 469 H CF₃ H H C₆H₁₃ 470 H OCF₃ H H CH₃ 471 H OCF₃ H H C₃H₇ 472 H OCF₃ H H C₅H₁₁ 473 H CF₃ F H C₂H₅ 474 H CF₃ F H C₃H₇ 475 H CF₃ F H C₆H₁₃ 476 H OCF₃ F H CH₃ 477 H OCF₃ F H C₃H₇ 478 H OCF₃ F H C₅H₁₁ 479 H CF₃ CF₃ H C₂H₅ 480 H CF₃ CF₃ H C₃H₇ 481 H CF₃ CF₃ H C₆H₁₃ 482 H CF₃ OCF₃ H CH₃ 483 H CF₃ OCF₃ H C₃H₇ 484 H CF₃ OCF₃ H C₅H₁₁ 485 H OCF₃ OCF₃ H C₂H₅ 486 H OCF₃ OCF₃ H C₃H₇ 487 H OCF₃ OCF₃ H C₆H₁₃

Examples 488 to 517

Example L¹ L² L³ L⁴ R 488 H F H H CH₃ 489 H F H H C₃H₇ 490 H F H H C₅H₁₁ 491 H F F H C₂H₅ 492 H F F H C₃H₇ 493 H F F H C₆H₁₃ 494 F F F F CH₃ 495 F F F F C₃H₇ 496 F F F F C₅H₁₁ 497 H CF₃ H H C₂H₅ 498 H CF₃ H H C₃H₇ 499 H CF₃ H H C₆H₁₃ 500 H OCF₃ H H CH₃ 501 H OCF₃ H H C₃H₇ 502 H OCF₃ H H C₅H₁₁ 503 H CF₃ F H C₂H₅ 504 H CF₃ F H C₃H₇ 505 H CF₃ F H C₆H₁₃ 506 H OCF₃ F H CH₃ 507 H OCF₃ F H C₃H₇ 508 H OCF₃ F H C₅H₁₁ 509 H CF₃ CF₃ H C₂H₅ 510 H CF₃ CF₃ H C₃H₇ 511 H CF₃ CF₃ H C₆H₁₃ 512 H CF₃ OCF₃ H CH₃ 513 H CF₃ OCF₃ H C₃H₇ 514 H CF₃ OCF₃ H C₅H₁₁ 515 H OCF₃ OCF₃ H C₂H₅ 516 H OCF₃ OCF₃ H C₃H₇ 517 H OCF₃ OCF₃ H C₆H₁₃

Examples 518 to 547

Example L¹ L² L³ L⁴ R 518 H F H H CH₃ 519 H F H H C₃H₇ 520 H F H H C₅H₁₁ 521 H F F H C₂H₅ 522 H F F H C₃H₇ 523 H F F H C₆H₁₃ 524 F F F F CH₃ 525 F F F F C₃H₇ 526 F F F F C₅H₁₁ 527 H CF₃ H H C₂H₅ 528 H CF₃ H H C₃H₇ 529 H CF₃ H H C₆H₁₃ 530 H OCF₃ H H CH₃ 531 H OCF₃ H H C₃H₇ 532 H OCF₃ H H C₅H₁₁ 533 H CF₃ F H C₂H₅ 534 H CF₃ F H C₃H₇ 535 H CF₃ F H C₆H₁₃ 536 H OCF₃ F H CH₃ 537 H OCF₃ F H C₃H₇ 538 H OCF₃ F H C₅H₁₁ 539 H CF₃ CF₃ H C₂H₅ 540 H CF₃ CF₃ H C₃H₇ 541 H CF₃ CF₃ H C₆H₁₃ 542 H CF₃ OCF₃ H CH₃ 543 H CF₃ OCF₃ H C₃H₇ 544 H CF₃ OCF₃ H C₅H₁₁ 545 H OCF₃ OCF₃ H C₂H₅ 546 H OCF₃ OCF₃ H C₃H₇ 547 H OCF₃ OCF₃ H C₆H₁₃

Examples 548 to 577

Example L¹ L² L³ L⁴ R 548 H F H H CH₃ 549 H F H H C₃H₇ 550 H F H H C₅H₁₁ 551 H F F H C₂H₅ 552 H F F H C₃H₇ 553 H F F H C₆H₁₃ 554 F F F F CH₃ 555 F F F F C₃H₇ 556 F F F F C₅H₁₁ 557 H CF₃ H H C₂H₅ 558 H CF₃ H H C₃H₇ 559 H CF₃ H H C₆H₁₃ 560 H OCF₃ H H CH₃ 561 H OCF₃ H H C₃H₇ 562 H OCF₃ H H C₅H₁₁ 563 H CF₃ F H C₂H₅ 564 H CF₃ F H C₃H₇ 565 H CF₃ F H C₆H₁₃ 566 H OCF₃ F H CH₃ 567 H OCF₃ F H C₃H₇ 568 H OCF₃ F H C₅H₁₁ 569 H CF₃ CF₃ H C₂H₅ 570 H CF₃ CF₃ H C₃H₇ 571 H CF₃ CF₃ H C₆H₁₃ 572 H CF₃ OCF₃ H CH₃ 573 H CF₃ OCF₃ H C₃H₇ 574 H CF₃ OCF₃ H C₅H₁₁ 575 H OCF₃ OCF₃ H C₂H₅ 576 H OCF₃ OCF₃ H C₃H₇ 577 H OCF₃ OCF₃ H C₆H₁₃

Examples 578 to 607

Example L¹ L² L³ L⁴ R 578 H F H H CH₃ 579 H F H H C₃H₇ 580 H F H H C₅H₁₁ 581 H F F H C₂H₅ 582 H F F H C₃H₇ 583 H F F H C₆H₁₃ 584 F F F F CH₃ 585 F F F F C₃H₇ 586 F F F F C₅H₁₁ 587 H CF₃ H H C₂H₅ 588 H CF₃ H H C₃H₇ 589 H CF₃ H H C₆H₁₃ 590 H OCF₃ H H CH₃ 591 H OCF₃ H H C₃H₇ 592 H OCF₃ H H C₅H₁₁ 593 H CF₃ F H C₂H₅ 594 H CF₃ F H C₃H₇ 595 H CF₃ F H C₆H₁₃ 596 H OCF₃ F H CH₃ 597 H OCF₃ F H C₃H₇ 598 H OCF₃ F H C₅H₁₁ 599 H CF₃ CF₃ H C₂H₅ 600 H CF₃ CF₃ H C₃H₇ 601 H CF₃ CF₃ H C₆H₁₃ 602 H CF₃ OCF₃ H CH₃ 603 H CF₃ OCF₃ H C₃H₇ 604 H CF₃ OCF₃ H C₅H₁₁ 605 H OCF₃ OCF₃ H C₂H₅ 606 H OCF₃ OCF₃ H C₃H₇ 607 H OCF₃ OCF₃ H C₆H₁₃

Examples 608 to 637

Example L¹ L² L³ L⁴ R 608 H F H H CH₃ 609 H F H H C₃H₇ 610 H F H H C₅H₁₁ 611 H F F H C₂H₅ 612 H F F H C₃H₇ 613 H F F H C₆H₁₃ 614 F F F F CH₃ 615 F F F F C₃H₇ 616 F F F F C₅H₁₁ 617 H CF₃ H H C₂H₅ 618 H CF₃ H H C₃H₇ 619 H CF₃ H H C₆H₁₃ 620 H OCF₃ H H CH₃ 621 H OCF₃ H H C₃H₇ 622 H OCF₃ H H C₅H₁₁ 623 H CF₃ F H C₂H₅ 624 H CF₃ F H C₃H₇ 625 H CF₃ F H C₆H₁₃ 626 H OCF₃ F H CH₃ 627 H OCF₃ F H C₃H₇ 628 H OCF₃ F H C₅H₁₁ 629 H CF₃ CF₃ H C₂H₅ 630 H CF₃ CF₃ H C₃H₇ 631 H CF₃ CF₃ H C₆H₁₃ 632 H CF₃ OCF₃ H CH₃ 633 H CF₃ OCF₃ H C₃H₇ 634 H CF₃ OCF₃ H C₅H₁₁ 635 H OCF₃ OCF₃ H C₂H₅ 636 H OCF₃ OCF₃ H C₃H₇ 637 H OCF₃ OCF₃ H C₆H₁₃

Examples 638 to 667

Example L¹ L² L³ L⁴ R 638 H F H H CH₃ 639 H F H H C₃H₇ 640 H F H H C₅H₁₁ 641 H F F H C₂H₅ 642 H F F H C₃H₇ 643 H F F H C₆H₁₃ 644 F F F F CH₃ 645 F F F F C₃H₇ 646 F F F F C₅H₁₁ 647 H CF₃ H H C₂H₅ 648 H CF₃ H H C₃H₇ 649 H CF₃ H H C₆H₁₃ 650 H OCF₃ H H CH₃ 651 H OCF₃ H H C₃H₇ 652 H OCF₃ H H C₅H₁₁ 653 H CF₃ F H C₂H₅ 654 H CF₃ F H C₃H₇ 655 H CF₃ F H C₆H₁₃ 656 H OCF₃ F H CH₃ 657 H OCF₃ F H C₃H₇ 658 H OCF₃ F H C₅H₁₁ 659 H CF₃ CF₃ H C₂H₅ 660 H CF₃ CF₃ H C₃H₇ 661 H CF₃ CF₃ H C₆H₁₃ 662 H CF₃ OCF₃ H CH₃ 663 H CF₃ OCF₃ H C₃H₇ 664 H CF₃ OCF₃ H C₅H₁₁ 665 H OCF₃ OCF₃ H C₂H₅ 666 H OCF₃ OCF₃ H C₃H₇ 667 H OCF₃ OCF₃ H C₆H₁₃

Examples 668 to 697

Example L¹ L² L³ L⁴ R 668 H F H H CH₃ 669 H F H H C₃H₇ 670 H F H H C₅H₁₁ 671 H F F H C₂H₅ 672 H F F H C₃H₇ 673 H F F H C₆H₁₃ 674 F F F F CH₃ 675 F F F F C₃H₇ 676 F F F F C₅H₁₁ 677 H CF₃ H H C₂H₅ 678 H CF₃ H H C₃H₇ 679 H CF₃ H H C₆H₁₃ 680 H OCF₃ H H CH₃ 681 H OCF₃ H H C₃H₇ 682 H OCF₃ H H C₅H₁₁ 683 H CF₃ F H C₂H₅ 684 H CF₃ F H C₃H₇ 685 H CF₃ F H C₆H₁₃ 686 H OCF₃ F H CH₃ 687 H OCF₃ F H C₃H₇ 688 H OCF₃ F H C₅H₁₁ 689 H CF₃ CF₃ H C₂H₅ 690 H CF₃ CF₃ H C₃H₇ 691 H CF₃ CF₃ H C₆H₁₃ 692 H CF₃ OCF₃ H CH₃ 693 H CF₃ OCF₃ H C₃H₇ 694 H CF₃ OCF₃ H C₅H₁₁ 695 H OCF₃ OCF₃ H C₂H₅ 696 H OCF₃ OCF₃ H C₃H₇ 697 H OCF₃ OCF₃ H C₆H₁₃

Examples 698 to 727

Example L¹ L² L³ L⁴ R 698 H F H H CH₃ 699 H F H H C₃H₇ 700 H F H H C₅H₁₁ 701 H F F H C₂H₅ 702 H F F H C₃H₇ 703 H F F H C₆H₁₃ 704 F F F F CH₃ 705 F F F F C₃H₇ 706 F F F F C₅H₁₁ 707 H CF₃ H H C₂H₅ 708 H CF₃ H H C₃H₇ 709 H CF₃ H H C₆H₁₃ 710 H OCF₃ H H CH₃ 711 H OCF₃ H H C₃H₇ 712 H OCF₃ H H C₅H₁₁ 713 H CF₃ F H C₂H₅ 714 H CF₃ F H C₃H₇ 715 H CF₃ F H C₆H₁₃ 716 H OCF₃ F H CH₃ 717 H OCF₃ F H C₃H₇ 718 H OCF₃ F H C₅H₁₁ 719 H CF₃ CF₃ H C₂H₅ 720 H CF₃ CF₃ H C₃H₇ 721 H CF₃ CF₃ H C₆H₁₃ 722 H CF₃ OCF₃ H CH₃ 723 H CF₃ OCF₃ H C₃H₇ 724 H CF₃ OCF₃ H C₅H₁₁ 725 H OCF₃ OCF₃ H C₂H₅ 726 H OCF₃ OCF₃ H C₃H₇ 727 H OCF₃ OCF₃ H C₆H₁₃ 

1. A cyclopenta [b]naphthalene compound of formula (I)

Z is in each case, independently of one another, a single bond, a double bond, —CF₂O—, —OCF₂—, —CH₂CH₂, —CF₂CF₂—, —C(O)O—, —OC(O)—, —CH₂O—, —OCH₂—, —CF═CH—, —CH═CF—, —CF═CF—, —CH═CH—or —C═C—, A is in each case, independently of one another, 1 ,4-phenylene, in which ═CH— may be replaced once or twice by ═N—, and which may be monosubstituted to tetrasubstituted, independently of one another, by halogen (—F, —Cl, —Br, —I), —CN, —CH₃, —CH₂F, —CHF₂, —CF₃, —OCH₃, —OCH₂F, —OCHF₂ or —OCF₃, 1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4-cyclohexadienylene, in which —CH₂— may be replaced once or twice, independently of one another, by —O— or —S— in such a way that heteroatoms are not directly adjacent, and which may be monosubstituted or polysubstituted by halogen, or is 1,3-cyclobutylene or bicyclo[2.2.2]octane, R is hydrogen, an alkyl, alkoxy, alkenyl or alkynyl radical having from 1 to 15 or 2 to 15 carbon atoms respectively which is unsubstituted, monosubstituted by —CF₃ or at least monosubstituted by halogen, where, in addition, one or more CH₂ groups in these radicals may each, independently of one another, be replaced by —O—, —S—, —CO—, —COO—, —OCO— or —OCO—O— in such a way that heteroatoms are not directly adjacent, halogen, —CN, —SCN, —NCS, —SF₅, —CF₃, —OCF₃, —OCHF₂ or —OCH₂F, n is 0, 1, 2 or 3, and L¹-L⁶ are each, independently of one another, hydrogen, an alkyl, alkoxy, alkenyl or alkynyl radical having from 1 to 15 or 2 to 15 carbon atoms respectively which is unsubstituted or at least monosubstituted by halogen, where, in addition, one or more CH₂ groups in these radicals may each, independently of one another, be replaced by —O—, —S—, —CO—, —COO—, —OCO— or —OCO—O—in such a way that heteroatoms are not directly adjacent, halogen, —CN, —SCN, —NCS, —SF₅, —CF₃, —OCF₃, —OCHF₂, —OCH₂F or —(Z-A-)_(n)—R.
 2. A cyclopenta[b]aphthalene compound according to claim 1 of formulae (II) to (VI)

Z is in each case, independently of one another, a single bond, a double bond, —CF₂O—, —OCF₂—, —CH₂CH₂—, —CF₂CF₂—, —C(O)O—, —OC(O)—, —CH₂O—, —OCH₂—, —CF═CH—, —CH═CF—, —CF═CF—, —CH═CH— or —C≡C—, A is in each case, independently of one another, 1 ,4—phenylene, in which ═CH—may be replaced once or twice by ═N—, and which may be monosubstituted to tetrasubstituted, independently of one another, by halogen (—F, —Cl, —Br, —I), —CN, —CH₃, —CH₂F, —CHF₂, —CF₃, —OCH₃, —OCH₂F, —OCHF₂ or —OCF₃, 1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4-cyclohexadienylene, in which —CH₂— may be replaced once or twice, independently of one another, by —O— or —S— in such a way that heteroatoms are not directly adjacent, and which may be monosubstituted or polysubstituted by halogen, or is 1,3-cyclobutylene or bicyclo[2.2.2]octane, R is hydrogen, an alkyl, alkoxy, alkenyl or alkynyl radical having from 1 to 15 or 2 to 15 carbon atoms respectively which is unsubstituted, monosubstituted by —CF₃ or at least monosubstituted by halogen, where, in addition, one or more CH₂ groups in these radicals may each, independently of one another, be replaced by —O—, —S—, —CO—, —COO—, —OCO— or —OCO—O— in such a way that heteroatoms are not directly adjacent, halogen, —CN, —SCN, —NCS, —SF₅, —CF₃, —OCF₃, —OCHF₂ or —OCH₂F, L², L³ are each, independently of one another, hydrogen, an alkyl, alkoxy, alkenyl or alkynyl radical having from 1 to 15 or 2 to 15 carbon atoms respectively which is unsubstituted or at least monosubstituted by halogen, where, in addition, one or more CH₂ groups in these radicals may each, independently of one another, be replaced by —O—, —S—, —CO—, —COO—, —OCO—or —OCO—O— in such a way that heteroatoms are not directly adjacent, halogen, —CN, —SCN, —NCS, —SF₅, —CF₃, —OCF₃, —OCHF₂, —OCH₂F or -(Z-A-)_(n)-R, L⁴ and L⁶ are each, independently of one another, hydrogen, an alkyl, alkoxy, alkenyl or alkynyl radical having from 1 to 15 or 2 to 15 carbon atoms respectively which is at least monosubstituted by halogen, where, in addition, one or more CH₂ groups in these radicals may each, independently of one another, be replaced by —O—, —S—, —CO—, —COO—, —OCO— or —OCO—O— in such a way that heteroatoms are not directly adjacent, halogen, —CN, —SF₅, —SCN, —NCS, —CF3, —OCF₃, —OCHF₂ or —OCH₂F, preferably with the proviso that L⁴ L⁶ cannot simultaneously be hydrogen, and n is 0, 1, 2 or
 3. 3. A cyclopenta[b]naphthalene compound according to claim 2, wherein A is


4. A cyclopenta[b]naphthalene compound according to claim 2, wherein L² and L³, independently of one another, are hydrogen, an alkoxy radical having from 1 to 7 carbon atoms, fluorine or chlorine.
 5. A cyclopenta[b]naphthalene compound according to claim 2, wherein L⁴ and L⁶, independently of one another, are —CF₃, fluorine or chlorine.
 6. A cyclopenta[b]naphthalene compound according to claim 1, wherein Z is a single bond, —CF₂O—, —OCF₂—, —CF₂CF₂—, —CH═CH—, —CF═CH—, —CH═CF— or —CF═CF—.
 7. A cyclopenta[b]naphthalene compound according to claim 1, wherein R is an alkyl radical, alkoxy radical or alkenyl radical having from 1 to 7 or 2 to 7 carbon atoms respectively.
 8. A liquid crystalline medium comprising at least two liquid-crystalline compounds, wherein at least one compound is a cyclopenta[b]naphthalene compound according to claim
 1. 9. An Electro optical display element containing a liquid-crystalline medium according to claim
 8. 10. A mesogenic liquid crystalline medium, comprising at least one cyclopenta[b]naphthalene compound according to claim
 1. 11. An Electro- optical light-control element which contains an electrode arrangement, at least one element for polarisation of light and a mesogenic control medium, where the light-control element is operated at a temperature at which the mesogenic control medium in the unaddressed state is in the isotropic phase, characterised in that the mesogenic control medium comprises at least one cyclopenta[b]naphthalene derivative according to claim
 1. 